1154 has 4 divisors (see below), whose sum is σ = 1734. Its totient is φ = 576.

The previous prime is 1153. The next prime is 1163. The reversal of 1154 is 4511.

1154 = T₂₂ + T₂₃ + ... + T₂₅.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4511 = 13 ⋅347.

It can be written as a sum of positive squares in only one way, i.e., 625 + 529 = 25^2 + 23^2 .

It is a Curzon number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 287 + ... + 290.

1154 is a deficient number, since it is larger than the sum of its proper divisors (580).

1154 is an equidigital number, since it uses as much as digits as its factorization.

1154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579.

The product of its digits is 20, while the sum is 11.

The square root of 1154 is about 33.9705755029. The cubic root of 1154 is about 10.4890286005.

Adding to 1154 its reverse (4511), we get a palindrome (5665).

The spelling of 1154 in words is "one thousand, one hundred fifty-four".